To get there they had to chisel away a concrete cell wall, and, of course, it had to be done slowly and on the QT.

Michael crouches next to the toilet in his cell. He's managed to pull it out about a foot from the wall and he USES his homemade Allen wrench to scrape out the concrete between the cinder blocks.

I was falling asleep on the floor when I felt a low harmony echoing up through the concrete of the cell next door.